1、四年级[sì nián jí]的英语是fourth grade (elementary school); senior (high school, college)。短语:senior maths class 高中数学课堂;senior English class teaching 农村高中英语课堂教学;senior politics class 高中思想政治课。
2、双语例句：他们还对这个学区的高等数学项目提供鼎力支持，这一项目曾经丛四年级开始，但现在将从六年级开始。They have been huge supporters of the districts advanced mathematics program, which once began in the fourth grade but will now start in the sixth.